Add more mappings to feature

* Before building feature, add extra mappings and ensure tests continue
to pass
Truncate table of paths in modal when long

* When selecting many mappings users previously had to scroll a long
way to the bottom to save their changes.
* Instead hide mappings after the first 9, and show a link to reveal
all of them
Exclude furniture URLs from hits

These are rarely mapped, are generally not very interesting, but flood the
analytics pages.
Only use 11 paths in feature

* Slightly faster tests
Merge pull request #199 from alphagov/faster-save-from-modal

Don't obscure the save button when bulk editing lots of mappings
Merge pull request #203 from alphagov/exclude_furniture_urls_from_hits

Exclude furniture URLs from hits